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Questions and Answers

What is the primary function of a power supply in an electronic product?

  • To store data
  • To cool down electrical components
  • To amplify signals
  • To convert AC to DC voltage (correct)
  • What is the role of the transformer in the AC operated power supply system?

  • To step up or step down the voltage (correct)
  • To convert AC voltage to DC voltage
  • To smooth the DC pulses into a constant voltage
  • To block high-frequency signals
  • Which of the following types of power supplies is NOT typically used?

  • High-frequency AC
  • Mechanical power supply (correct)
  • AC operated power supply
  • Battery with battery charger
  • What is the output frequency of the DC pulses generated by the rectifier in this power supply system?

    <p>60 Hz</p> Signup and view all the answers

    Which component is likely to be part of a full-wave rectifier circuit?

    <p>Diode bridge</p> Signup and view all the answers

    What does the term 'Peak Inverse Voltage' refer to in power supply systems?

    <p>The maximum reverse voltage a diode can withstand</p> Signup and view all the answers

    After rectification, what process smoothes the DC pulses into a steady output voltage?

    <p>Filtering</p> Signup and view all the answers

    What type of voltage does the half-wave rectifier output?

    <p>Half-wave output</p> Signup and view all the answers

    What is the purpose of filtering in power supply circuits?

    <p>To smooth out voltage fluctuations</p> Signup and view all the answers

    What is typically used in conjunction with the output DC voltage in most applications?

    <p>A regulator circuit</p> Signup and view all the answers

    Which power supply type is commonly associated with rechargeable devices?

    <p>Battery with battery charger</p> Signup and view all the answers

    Which component is responsible for converting sine waves into DC pulses?

    <p>Rectifier</p> Signup and view all the answers

    What component would you expect to find in a transformer?

    <p>Core made of magnetic material</p> Signup and view all the answers

    In which scenario might multiple DC voltages be generated in a power supply?

    <p>When utilizing multiple regulators or DC-DC converters</p> Signup and view all the answers

    Which type of rectifier configuration allows for the use of a single diode?

    <p>Half-wave rectifier</p> Signup and view all the answers

    Which primary function does a filter serve in the power supply system?

    <p>Smooth the pulses into a constant voltage</p> Signup and view all the answers

    What is the peak output voltage of a bridge rectifier relative to the input voltage?

    <p>Input voltage minus 0.7 V</p> Signup and view all the answers

    Which statement accurately describes the configuration of a bridge rectifier?

    <p>It utilizes four diodes in a specific arrangement</p> Signup and view all the answers

    How does the output frequency of a bridge rectifier compare to the input frequency?

    <p>It is twice the input frequency</p> Signup and view all the answers

    In the context of a bridge rectifier, how is the secondary voltage represented in the equations?

    <p>It is the voltage seen at each diode input</p> Signup and view all the answers

    What happens to the output waveform when a bridge rectifier is used?

    <p>The output waveform is a full-wave signal</p> Signup and view all the answers

    What is the role of the diodes in a bridge rectifier during the positive half cycle?

    <p>They conduct current and allow positive voltage to pass</p> Signup and view all the answers

    What is the function of the 0.7 V drop in a diode within a bridge rectifier?

    <p>It represents the forward voltage drop across the diode</p> Signup and view all the answers

    Which configuration accurately represents the equivalent circuit of a bridge rectifier during the negative half cycle?

    <p>Two specific diodes will conduct while the others are off</p> Signup and view all the answers

    What is a characteristic of the ripple signal in power supply filtering?

    <p>It typically poses no significant problems.</p> Signup and view all the answers

    Which type of analysis is more common for analyzing filters?

    <p>Time domain analysis</p> Signup and view all the answers

    What is true regarding a capacitor-input filter?

    <p>The peak value of the rectified signal passes to the load resistor.</p> Signup and view all the answers

    What happens to the capacitor during the discharge process?

    <p>It discharges through the load until the next DC pulse.</p> Signup and view all the answers

    Which factors are considered when selecting capacitor values in filtering?

    <p>Capacitor charge-discharge curve and pulse frequency</p> Signup and view all the answers

    What is the purpose of the diode in the capacitor charge and discharge process?

    <p>To permit charging and prevent discharging at the same time</p> Signup and view all the answers

    What effect does a large capacitor have in a capacitor-input filter?

    <p>It reduces the ripple to a small value.</p> Signup and view all the answers

    What defines the charging process of the capacitor in power supply filtering?

    <p>It charges to the peak of the sine wave less any diode drops.</p> Signup and view all the answers

    What is the formula for calculating the average output voltage (Vdc) of a bridge rectifier?

    <p>Vdc = 2VP/p</p> Signup and view all the answers

    In a bridge rectifier, what is the expected relation between the output frequency (fout) and the input frequency (fin)?

    <p>fout = 2fin</p> Signup and view all the answers

    What does Peak Inverse Voltage (PIV) refer to in a rectifier circuit?

    <p>Maximum voltage across the nonconducting diode</p> Signup and view all the answers

    What condition must hold true for the choke-input filter in terms of reactance?

    <p>XL &gt;&gt; XC</p> Signup and view all the answers

    In a half-wave rectifier with a capacitor-input filter, how is the Peak Inverse Voltage calculated?

    <p>PIV = 2VP</p> Signup and view all the answers

    What is the purpose of the filter in a power supply?

    <p>To smooth DC pulses into a constant DC voltage</p> Signup and view all the answers

    What percentage of the average diode current in a full-wave rectifier equals the DC load current?

    <p>50%</p> Signup and view all the answers

    How can the filtering process in a power supply be visualized?

    <p>In the frequency domain and time domain</p> Signup and view all the answers

    Which component is commonly used to protect against surge current in a circuit?

    <p>Slow-blow fuse</p> Signup and view all the answers

    What is the approximate voltage drop across the output of a bridge rectifier as per the second approximation?

    <p>1.4 V</p> Signup and view all the answers

    What is the role of a regulator in a power supply circuit?

    <p>Keep output voltage constant</p> Signup and view all the answers

    What happens to the average value of a rectified signal in a choke-input filter?

    <p>It passes to the load resistor</p> Signup and view all the answers

    When using a bridge rectifier, how is the output voltage (Vout) affected when XL is much larger than XC?

    <p>Vout = Vin / XL</p> Signup and view all the answers

    In a bridge rectifier with a capacitor-input filter, how is the Peak Inverse Voltage characterized?

    <p>PIV = VP</p> Signup and view all the answers

    What is typically the simplest form of a voltage regulator?

    <p>Zener diode</p> Signup and view all the answers

    For a full-wave rectifier with a capacitor-input filter, how is the diode current related to the DC load current?

    <p>Idiode = 0.5Idc</p> Signup and view all the answers

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